A translational polarization rotator.
A translational polarization rotator.
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DOI：
10.1364/ao.51.006824
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发表时间：
2012-06
期刊：
影响因子：
1.9
通讯作者：
D. Chuss;Edward J. Wollack;G. Pisano;S. Ackiss;K. U-yen;M. W. Ng
中科院分区：
文献类型：
--
作者：
D. Chuss;Edward J. Wollack;G. Pisano;S. Ackiss;K. U-yen;M. W. Ng
我们探讨了一种自由空间偏振调制器，在该调制器中，在右手和左手圆偏振分量之间引入可变相位，并用于旋转出射光束相对于入射光束的线偏振。在这种器件中，偏振态由圆偏振器分离，圆偏振器由四分之一波片和线栅组成。可移动反射镜位于圆偏振器后面并平行于圆偏振器。当偏振镜距离改变时，入射线偏振将旋转与引入的相位延迟成比例的角度。我们展示了一个原型设备，调制斯托克斯Q和U超过20%的带宽，从77到94 GHz。
We explore a free-space polarization modulator in which a variable phase is introduced between the right- and left-handed circular polarization components and used to rotate the linear polarization of the outgoing beam relative to that of the incoming beam. In this device, the polarization states are separated by a circular polarizer that consists of a quarter-wave plate in combination with a wire grid. A movable mirror is positioned behind and parallel to the circular polarizer. As the polarizer-mirror distance is changed, an incident linear polarization will be rotated through an angle that is proportional to the introduced phase delay. We demonstrate a prototype device that modulates Stokes Q and U over a 20% bandwidth, from 77 to 94 GHz.